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(11) | EP 1 411 688 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Method and apparatus for multicast data retransmission |
| (57) A reliable multicast data retransmission method by grouping wireless terminals in
a wireless communication environment and performing multicast data retransmission
for a particular group of wireless terminals that needs multicast data retransmission,
thereby providing reliable multicast data retransmission and improving the efficiency
of a network. The multicast data retransmission method includes grouping wireless
terminals based on distances between an access point and the wireless terminals and
the amplitudes of signals output from the wireless terminals, selecting a repeater,
which is to retransmit multicast packets, from each group and arranging the order
in which repeaters retransmit multicast packets, creating a multicast packet train
header indicating characteristics of each of the multicast packets, multicasting the
created multicast packet train header. The multicast packets are retransmitted in
the arranged order. |